<template>
  <div class="char1">
      <!-- 自定义一个div来装我们的图 -->
    <div id="main" style="width: 90%;height:800px;"></div>
  </div>

</template>

<script>
import * as echarts from 'echarts';
export default {
  data () {
    return {
      option : {
    tooltip: {
        trigger: 'axis',
        axisPointer: {
            type: 'cross',
            crossStyle: {
                color: '#999'
            }
        }
    },
    toolbox: {
        feature: {
            dataView: {show: true, readOnly: false},
            magicType: {show: true, type: ['line', 'bar']},
            restore: {show: true},
            saveAsImage: {show: true}
        }
    },
    legend: {
        data: ['发明申请', '实用新型', '外观设计']
    },
    xAxis: [
        {
            type: 'category',
            data: ['1月', '2月', '3月', '4月', '5月', '6月', '7月', '8月', '9月', '10月', '11月', '12月'],
            axisPointer: {
                type: 'shadow'
            }
        }
    ],
    yAxis: [
        {
            type: 'value',
            name: '水量',
            min: 0,
            max: 250,
            interval: 50,
            axisLabel: {
                formatter: '{value} ml'
            }
            
        },
        {
            type: 'value',
            name: '温度',
            min: 0,
            max: 25,
            interval: 5,
            axisLabel: {
                formatter: '{value} °C'
            }
        }
    ],
    series: [
        {
            name: '蒸发量',
            type: 'bar',
            data: [2.0, 4.9, 7.0, 23.2, 25.6, 76.7, 135.6, 162.2, 32.6, 20.0, 6.4, 3.3]
        },
        {
            name: '降水量',
            type: 'bar',
            data: [2.6, 5.9, 9.0, 26.4, 28.7, 70.7, 175.6, 182.2, 48.7, 18.8, 6.0, 2.3]
        },
        {
            name: '平均温度',
            type: 'line',
            yAxisIndex: 1,
            data: [2.0, 2.2, 3.3, 4.5, 6.3, 10.2, 20.3, 23.4, 23.0, 16.5, 12.0, 6.2]
        }
    ]
}
    }
  },
  methods: {
    draw () {
        //通过echarts初始化我们的div
      let myChart = echarts.init(document.getElementById('main'));
        //为这个echarts的图添加属性
      myChart.setOption(this.option, true)
    }

  },
  watch: {
    //数据变化时自动重画，在控制台修改message,会自动重画
    message: function () {
      this.draw();
    }
  },
  mounted () {
      //页面加载的时候，调用画图方法，画图
    this.draw();
  }
}
</script>
<style scoped>
.char1 {
  height: 100%;
  width: 100%;
  text-align: center;
  line-height: 160px;
}
</style>
